Study on the Permeability Evolution and Its Formation Mechanism of Xiaojihan Aquifer Coal Seam under Plastic Flow

Table 2

Pore pressure at upper and lower ends.

Confining pressure (MPa)	Hydraulic pressure
	Upper pore pressure (MPa)	Lower pore pressure (MPa)
2	1.7	0.2
4	3.5	2.0
6	5.5	4.0
8	7.5	6.0
10	9.5	8.0